Are we alone in the universe? Its a question that has, despite extensive and sometimes ingenious attempts, yet to be answered. In one of the most ambitious searches for extraterrestrial intelligence ever conducted, Chinese scientists have used the world's largest radio telescope to scan the famous TRAPPIST-1 star system for signs of alien technology. The Five hundred metre Aperture Spherical Telescope is the world's largest single dish radio telescope, and the search for extraterrestrial intelligence (SETI) is one of its five key science objectives.
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